Python Programming
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find these 3 mistakes or bugs and correct them. run this program, it will create the result like the above result.

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Question :

There is a program from the Textbook (Machine Learning In action, Chapter 9, page 179~Page 184) stop before the section (Using CART for regress)

It is about CART  in an ordinary tree with pruning. But there are 3 places with mistakes in these programs. These mistakes may be arise owing to the version difference of Python, or the author's ignorance. All these mistakes are very small. You need only do a little change to make this program normal. If this program runs correctly it will produce a picture like the following one:

It means, the program split these points by much split value(split line) into left and right, then left and right is split again into left and right. so it a binary tree. this tree is represented in Dict. You may carefully read the text.

Your task is to find these 3 mistakes(or bugs) and correct them. run this program, it will create the result like the above result.

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